ref: 1c2df9cd485765e941342f2d76270a49bd177c85
parent: d1e3d0467c7efbc6eeddefc9d568cf928110e8fb
author: Marco <marpan@google.com>
date: Thu Jan 28 07:10:38 EST 2016
vp9: encoder-breakout: Modify UV thresholds. Set UV thresholds to 0 for encoder breakout if block is detected as skin. Change-Id: Iaaa30b5cc8bae4cf611f8ea8eba693b730e32a3f
--- a/vp9/encoder/vp9_pickmode.c
+++ b/vp9/encoder/vp9_pickmode.c
@@ -812,7 +812,7 @@
mi->mv[0].as_mv.col > 64 ||
mi->mv[0].as_mv.col < -64)
motion_low = 0;
- if (x->encode_breakout > 0 && motion_low == 1 && !x->sb_is_skin) {+ if (x->encode_breakout > 0 && motion_low == 1) {// Set a maximum for threshold to avoid big PSNR loss in low bit rate
// case. Use extreme low threshold for static frames to limit
// skipping.
@@ -852,6 +852,12 @@
if (var <= thresh_ac && (sse - var) <= thresh_dc) {unsigned int sse_u, sse_v;
unsigned int var_u, var_v;
+ unsigned int thresh_ac_uv = thresh_ac;
+ unsigned int thresh_dc_uv = thresh_dc;
+ if (x->sb_is_skin) {+ thresh_ac_uv = 0;
+ thresh_dc_uv = 0;
+ }
// Skip UV prediction unless breakout is zero (lossless) to save
// computation with low impact on the result
@@ -867,7 +873,7 @@
xd->plane[1].dst.stride, &sse_u);
// U skipping condition checking
- if (((var_u << 2) <= thresh_ac) && (sse_u - var_u <= thresh_dc)) {+ if (((var_u << 2) <= thresh_ac_uv) && (sse_u - var_u <= thresh_dc_uv)) {var_v = cpi->fn_ptr[uv_size].vf(x->plane[2].src.buf,
x->plane[2].src.stride,
xd->plane[2].dst.buf,
@@ -874,7 +880,7 @@
xd->plane[2].dst.stride, &sse_v);
// V skipping condition checking
- if (((var_v << 2) <= thresh_ac) && (sse_v - var_v <= thresh_dc)) {+ if (((var_v << 2) <= thresh_ac_uv) && (sse_v - var_v <= thresh_dc_uv)) {x->skip = 1;
// The cost of skip bit needs to be added.